BIOS sees secondary IDE DVD, but XP does not...?

I'm kind of stumped on this one. The BIOS sees the DVD ROM I have installed on the secondary IDE port on my M10000 (It allowed me to install XP from it)

But for some reason when I boot to XP I do not see it in explorer? I did see it once, and then it disappeared again

The Device Manager says the secondary IDE is working properly. Does anyone have any ideas? It may be a bad IDE cable so I am going to buy a new one later, but since the BIOS can see the DVD I am doubting the cable is at fault.